Indwelling catheter set

• US 7,318,818 B2
• Filed: 04/07/2004
• Issued: 01/15/2008
• Est. Priority Date: 04/08/2003
• Status: Expired due to Fees

• Current Assignee: Nipro Corporation
• Original Assignee: Nipro Corporation
• Inventors: Yano, Tsuyoshi, Yashiro, Kenji, Higaki, Yoshio
• Primary Examiner(s): Sirmons; Kevin C.
• Assistant Examiner(s): GILBERT, ANDREW M
• Application Number:
  US10/819,129
• Publication Number:
  US 20040204691A1
• Time in Patent Office: 1,378 Days
• Field of Search: 60416701-16704, 604/164.01, 604/164.04, 604/164.07, 604/253, 604/257, 604/264
• US Class Current: 604/164.07
• CPC Class Codes: A61M 2005/1587 suitable for being connected to an infusion line after insertion into a patient
• CPC Class Codes: A61M 25/0097 characterised by the hub connectors A61M39/10
• CPC Class Codes: A61M 25/0606 "Over-the-needle" catheter assemblies, e.g. I.V. catheters
• CPC Class Codes: A61M 39/1011 Locking means for securing connection; Additional tamper safeties A61M39/16 takes precedence
• CPC Class Codes: A61M 5/158 Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body

Abstract

An indwelling catheter set comprises a cannula housing. The cannula housing comprises: (a) a catheter disposed substantially in the axial direction and formed into a hollow body opened at its distal and proximal ends; and (b) a catheter hub comprising a through bore extending substantially in the axial direction for inserting the proximal portion of the catheter therethrough. The catheter is adhered or welded to the catheter hub.

Claims

1. An indwelling catheter set comprising:

(a) a cannula housing; and

(b) an insertion hub and an infusion hub to be detachably connected to the cannula housing,

the cannula housing comprising;

(a) a catheter disposed substantially in the axial direction and formed into a hollow body opened at its distal and proximal ends;

(b) a catheter hub having a distal portion and a proximal portion and comprising a through bore extending substantially in the axial direction of the hub for inserting a proximal portion of the catheter therethrough, an upwardly projecting central protrusion at the lateral center of the distal portion, upwardly projecting side protrusions on the left and the right sides of the proximal portion, and a depression depressed downward at a remaining portion of the hub,

wherein the catheter is adhered or welded to the catheter hub,

and wherein a proximal portion of the through bore is formed as a connecting port for feeding liquid;

(c) a plug formed of resilient material for sealing the connecting port and inserted into the connecting port from its proximal end; and

(d) a guide inserted into a portion of the connecting port disposed proximally of the plug,

wherein the guide is formed into a hollow body opened at its distal and proximal ends for preventing the plug from dropping off the connecting port,

the guide allowing detachable insertion of an insertion needle of the insertion hub and an infusion needle of the infusion hub from proximal ends thereof,

at least a proximal portion of the interior of the guide being formed into a tapered bore tapered toward the distal end of the guide, and

at least the proximal portion of the interior of the guide having an inner surface for guiding the insertion needle and the infusion needle to a substantially axial center of the connecting port,

the insertion hub comprising;

(a) the insertion needle disposed substantially in the axial direction and formed into a hollow body opened at its distal and proximal ends, the insertion needle being detachably inserted into the plug and the catheter from proximal ends thereof when connecting the insertion hub to the cannula housing; and

(b) an insertion needle hub provided at a proximal portion of the insertion needle, the insertion needle hub being detachably connected to the catheter hub from its proximal end when connecting the insertion hub to the cannula housing,

the infusion hub comprising;

(a) the infusion needle for feeding liquid disposed substantially in the axial direction and formed into a hollow body opened at its distal and proximal ends, the infusion needle being detachably inserted into the plug from its proximal end, when connecting the infusion hub to the cannula housing, so as to communicate with the catheter; and

(b) an infusion tubing hub provided at a proximal portion of the infusion needle, the infusion tubing hub being detachably connected to the catheter hub from its proximal end when connecting the infusion hub to the cannula housing,

wherein the insertion needle hub and the infusion tubing hub respectively comprise;

(a) a main body to be detachably inserted between the side protrusions of the catheter hub when connecting the insertion hub or the infusion hub to the cannula housing; and

(b) a pair of left and right engaging claws to be detachably inserted between the central protrusion and the side protrusions of the catheter hub and to be disposed distally of the side protrusions, when connecting the insertion hub or the infusion hub to the cannula housing, so as to be detachably engaged with the side protrusions.

2. An indwelling catheter set according to claim 1, wherein the catheter and the catheter hub are formed of the same plastic material by injection molding.

3. An indwelling catheter set according to claim 1, wherein the outer surface of the catheter is roughened by surface processing.

4. An indwelling catheter set according to claim 1, wherein a proximal end portion of the catheter is flared so as to be enlarged toward its proximal end.

5. An indwelling catheter set according to claim 1, wherein the guide comprises in the interior:

(a) a straight bore forming a distal portion of the interior of the guide, the straight bore having an inner diameter substantially constant in the axial direction; and

(b) the tapered bore forming the proximal portion of the interior of the guide.